77990 leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 64% of adults in 77990 typically vote, near the U.S. average of about 62%. Among adults in 77990, ~21% vote Democratic, ~43% Republican, and ~36% don't vote. The map below shows estimated turnout by block group.
How 77990 compares
Among zip codes within 15 miles, 77990 leans more Republican than 2 of 4 neighbors.
77990 runs about 20 points more Republican than Texas as a whole.
Politics vary noticeably by block within 77990. The north side is the most Republican-leaning (R+73) and the northwest side is the least Republican-leaning (R+28), a spread of about 45 points.
Why 77990 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 77990, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 1% of residents in 77990 live in densely developed areas, about 33 points below the Texas average of 35%.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 77990, TX sits in the bottom tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 77990 looks the way it does
Homeowners vote more often than renters. About 91% of households in 77990 own their home, about 17 points above the Texas average of 75%. Limited routine healthcare access lines up with lower turnout, and 77990 sits in the bottom quarter on routine-care measures. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
Sources and methodology
Precinct-level voting records used to fit the model come from Texas Secretary of State, Elections Division, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.